US20100186150A1 - Protective headgear compression member - Google Patents
Protective headgear compression member Download PDFInfo
- Publication number
- US20100186150A1 US20100186150A1 US12/360,864 US36086409A US2010186150A1 US 20100186150 A1 US20100186150 A1 US 20100186150A1 US 36086409 A US36086409 A US 36086409A US 2010186150 A1 US2010186150 A1 US 2010186150A1
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- Prior art keywords
- flange
- cell
- plate
- member defined
- layer
- Prior art date
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- Abandoned
Links
- 230000006835 compression Effects 0.000 title claims abstract description 28
- 238000007906 compression Methods 0.000 title claims abstract description 28
- 230000001681 protective effect Effects 0.000 title claims abstract description 13
- 239000012858 resilient material Substances 0.000 claims abstract 5
- 239000006260 foam Substances 0.000 claims description 2
- 239000002984 plastic foam Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- 230000004044 response Effects 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 206010019196 Head injury Diseases 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 2
- 239000002775 capsule Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- -1 vinyl nitrile Chemical class 0.000 description 2
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229920002457 flexible plastic Polymers 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000037081 physical activity Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A42—HEADWEAR
- A42B—HATS; HEAD COVERINGS
- A42B3/00—Helmets; Helmet covers ; Other protective head coverings
- A42B3/04—Parts, details or accessories of helmets
- A42B3/10—Linings
- A42B3/12—Cushioning devices
- A42B3/125—Cushioning devices with a padded structure, e.g. foam
- A42B3/128—Cushioning devices with a padded structure, e.g. foam with zones of different density
-
- A—HUMAN NECESSITIES
- A42—HEADWEAR
- A42B—HATS; HEAD COVERINGS
- A42B3/00—Helmets; Helmet covers ; Other protective head coverings
- A42B3/04—Parts, details or accessories of helmets
- A42B3/10—Linings
- A42B3/12—Cushioning devices
- A42B3/121—Cushioning devices with at least one layer or pad containing a fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
- F16F13/002—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising at least one fluid spring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
- F16F9/04—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall
- F16F9/0472—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall characterised by comprising a damping device
- F16F9/0481—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall characterised by comprising a damping device provided in an opening to the exterior atmosphere
Definitions
- This invention relates to protective headgear and other impact absorbing structures. It relates especially to an impact absorbing compression member for use therein.
- Headgear such as a helmet is often worn by individuals during games and other physical activities to help protect the wearers from head injury. Head injury can result from impact forces due to contact with other people or objects.
- helmets generally fall into one of two categories, i.e. single impact helmets or multiple impact helmets. Single impact helmets undergo permanent deformation under impact, whereas multiple impact helmets are capable of withstanding multiple blows.
- the wearers of single impact helmets include, for example, bicyclists and motorcyclists.
- participants in sports such as hockey and football and construction workers generally wear multiple impact helmets.
- Both categories of helmets have similar constructions which include a semi-rigid outer shell which distributes the force of an impact over a wide area, a crushable layer inside the shell which reduces the force of the impact on the wearer's head, and usually also an inner liner that helps to shape the helmet to the wearer's head.
- helmets also include a chin strap for securing the helmet to the wearer's head.
- Such headgear incorporating a plurality of energy-absorbing layers.
- headgear is disclosed, for example, in publications WO2006/089234 and WO2006/089235 and US2007/0190292, published Aug. 16, 2007, the contents of all of which are hereby incorporated by reference herein.
- helmets include a semi-rigid outer layer or shell, an inner layer and a middle layer between the outer and inner layers.
- This middle layer is composed of a plurality of individual compressible cells disposed in a fluid-containing interstitial region formed by the inner and outer layers. At least one passageway is provided by which fluid can leave the middle layer as the outer layer deforms in response to an impact on the helmet.
- Such helmets may also contain a dynamic inner liner whose shape can change to conform to a wearer's head as each helmet is drawn down on the head by the associated chin strap; see WO2006/089098.
- each impact absorbing cell of the middle layer of the helmet comprises at least one thin-walled enclosure having an uncompressed configuration which defines a hollow chamber, a volume of fluid at least partially filling that chamber, at least one orifice through the enclosure wall that resistably vents fluid from the chamber in response to an impact on the enclosure and an impact-absorbing mechanism associated with the enclosure that resists yielding in response to an initial phase of an impact on the enclosure, and that yields to the impact after the initial phase of the impact to allow the remainder of the impact to be managed by the fluid venting from the orifice.
- the dynamic inner liner is composed of individual compressible elements positioned at the cell locations and whose shapes can change to conform to a wearer's head as the helmet is drawn down on the head by an associated chin strap assembly.
- each cell and the corresponding compressible element form a unitary compression member.
- the total thickness of the helmet layers is larger than might be desired.
- the compressible structures forming the dynamic inner liner of the helmet are usually simply foam pads or capsules adhered to the underside of the associated cell and are prone to bottoming out when the helmet is pressed against the wearer's head by high impact forces, thus causing discomfort to the wearer. Simply increasing the thickness of the pads in an attempt to overcome this problem results in an undesirable increase in helmet size.
- a compression member in the nature of a shock absorber for providing the middle layer and liner of a helmet or other protective structure.
- a further object of the invention is to provide such a compression member which has minimal overall thickness, yet whose components do not tend to bottom out under the compression forces encountered during normal use of the member.
- Another object of the invention is to provide a compression member of this type which is relatively easy to releasably attach to the inner layer of a helmet or other protective structure.
- Still another object of the invention is to provide such a compression member which when incorporated into a helmet along with a multiplicity of other similar members produces headgear which is comfortable to wear for a prolonged period even when the helmet is repeatedly impacted from without.
- a further object is to provide such a compressible member composed of a few molded plastic parts which are relatively easy to assemble.
- my protective helmet compression member includes a hollow, axially symmetric compression cell having an upper wall, a side wall and a flanged bottom wall.
- the compression member also includes a compressible liner element mounted to the flange.
- This element is composed of a hollow flexible envelope having a bottom wall and a side wall extending upwardly/inwardly from that bottom wall and connected to a radial flange that is secured flush to the cell flange.
- the envelope is substantially filled by one or more resilient pads.
- the bottom wall of the cell inboard the cell flange is curved upwardly, giving the cell a dished or concave undersurface to provide additional clearance for the pad(s).
- This construction along with the pad(s) enables the compression member to withstand appreciable compression forces without the liner element bottoming out against the underside of the cell. Resultantly, when a multiplicity of the compression members are incorporated into a protective structure such as a football helmet, the structure is comfortable to wear for a prolonged period, despite repeated impacts thereto.
- FIG. 1 is a side elevational view of a protective helmet incorporating compression members in accordance with this invention
- FIG. 2 is a perspective view, on a larger scale, showing one of the compression members of the FIG. 1 helmet in greater detail;
- FIG. 3 is an exploded perspective view showing the components of the FIG. 2 compression member in greater detail
- FIG. 4 is a sectional view taken along line 3 - 3 of FIG. 2 .
- compression members incorporating the invention and indicated generally at 10 are shown incorporated into a protective structure, i.e., a football helmet H having an outer layer or shell shown in phantom at O and an inner layer I.
- Members 10 are releasably secured to layer I.
- shell O is of a relatively hard plastic material that deforms locally and radially in response to an impact
- the inner layer I may be of a softer, less rigid material.
- Each compression member 10 comprises a hollow, compressible, resilient cell 12 which extends between the inner and outer layers, and a compressible liner element 14 located directly opposite cell 12 and which projects from the interior surface of layer I.
- Cells 12 collectively form a helmet middle layer in an interstitial region between layers O and I and elements 14 collectively form a dynamic inner liner of the helmet.
- each member 10 is secured in a different opening P in inner layer I by capturing the edge of that opening P between the associated cell 12 and its liner element 14 .
- the inner layer I is somewhat elastic so that the member 10 may be attached to layer I by forcing its cell 12 through opening P, whose edge then snaps into a peripheral recess around the cell as will be described in detail later.
- Each cell 12 comprises a top wall 22 , a bowed side wall 24 composed of a pair of back-to-back frustoconically shaped segments 24 a and 24 b and a radial flange 26 extending out from the free lower edge of the segment 24 b, leaving a large central opening within the flange.
- a vent hole 27 is provided in top wall 22 .
- the top wall 22 has a diameter of 1.9 in.
- the side wall 24 has a diameter of 2.0 in. at the equator with an included angle ⁇ of 155 to 162 degrees between segments 24 a and 24 b
- the flange 26 has an outer diameter of 2.3 in.
- Cell 12 is of a material, e.g. TPU, which is relatively stiff, yet allows the cell as a whole to flex to provide the impact absorbing characteristics described in the above publications.
- a plate 28 of the same material about 0.04 in. thick is positioned against the underside of the flange and the two are welded together at their edges to close and complete the bottom of the cell.
- a central area 28 a of the plate is domed or upwardly curved (about 0.08 in. deflection) to conform to a typical head curvature for reasons to be described later.
- a circular step or wall 28 b may be provided on the upper surface of the plate to center the cell on the plate.
- each element 14 is coaxial to cell 12 and has more or less the same footprint as the cell.
- each element 14 is a composite structure which includes a cup-like hollow envelope or membrane 32 , a first, soft resilient pad 34 and a second, smaller, denser resilient pad 36 .
- Envelope 32 is of a flexible plastic material such as TPU. It has a circular bottom wall 38 with a gently rounded edge margin 38 a which extends up to the radially outer edge of a relatively stiff annular shoulder 42 .
- the inner edge of shoulder 42 connects to a short, e.g. 0.06 in., upstanding neck 44 whose upper end transitions to a radially outer flange 46 .
- the outer diameter of flange 46 is substantially the same as that of flange 26 and plate 28 of cell 12 .
- the bottom wall 38 , 38 a of envelope 32 while strong, is also quite thin and flexible, whereas the envelope shoulder, neck and flange have thicker walls so that they are individually relatively stiff.
- the wall 38 , 38 a has a thickness of 0.02 inch and the shoulder, neck and flange have wall thicknesses of 0.02, 0.03 and 0.03 inch, respectively.
- the overall height of the liner element is in the order of 0.33 inch.
- the pad 34 is die cut of a foam material, e.g. open cell polyurethane foam of density 18 to 15 lb./cu.ft. and its diameter, e.g. 2.05 in., and thickness, e.g. 0.28 in., are such that the pad can fit within the confines of envelope bottom wall 38 , 38 a.
- a foam material e.g. open cell polyurethane foam of density 18 to 15 lb./cu.ft. and its diameter, e.g. 2.05 in., and thickness, e.g. 0.28 in.
- the smaller pad 36 is die cut of a stiffer plastic foam material, e.g. vinyl nitrile 602 having a density 17 to 25 lb./cu.ft. and its diameter, e.g. 1.4 in., and thickness, e.g. 0.20 in., are such as to enable that pad to fit within the neck 44 of envelope 32 between pad 36 and plate 28 .
- the pads 34 and 36 are die cut in the circular shapes shown in FIG. 3 , not FIG. 4 . They assume the shapes shown in FIG. 4 when the envelope or membrane 38 , 38 a is installed around them.
- the pad 34 is inserted into envelope 32 so that it is flush against bottom wall 38 .
- pad 36 is positioned against the underside of plate portion 28 a within neck 44 .
- an adhesive or double sided tape (not shown) may be interposed between pad 36 and the plate portion 28 a.
- the flange 46 of envelope 32 and the flange 26 of cell 12 are positioned together coaxially and welded or otherwise secured together as shown at 50 in FIG. 4 . This leaves the shoulder 42 and neck 44 free to flex in the axial direction.
- the thickness of pad 36 is such that when the two flanges are secured together at 50 , the two pads 34 and 36 substantially fill the space between the plate 28 and bottom wall 38 , 38 a so that the underside of the liner element 14 constitutes a soft pillow that conforms to the shape of any surface contacting that wall.
- the area thereof within the cell 12 is upwardly curved or dished as described above also helps in this respect in that it provides additional clearance between the plate and a wearer's head without increasing the overall height of the compression member 10 .
- This height is typically in the order of 2.0 in. for a cell 10 used in a helmet. That height may me as small as 1.0 in. when the cell is used in other applications, e.g. as a jaw shock absorber.
- each compression member 10 When a player dons the helmet H, the composite liner element 14 of each compression member 10 conforms to the wearer's head resulting in a very comfortable fit of the helmet to the head. Yet, each member 10 still has a relatively low profile within helmet H so that the helmet is no larger than a conventional helmet that does not incorporate the members 10 . Finally, because of the aforesaid composite construction of the liner element 14 , that element is not likely to bottom out during normal use of the helmet.
Abstract
A protective headgear compression member includes a hollow compression cell having a top wall, a bowed side wall and a bottom wall and a liner element secured to that bottom wall coaxially to said cell. The liner element is composed of a flexible envelope substantially filled with resilient material and the envelope is secured to the bottom wall via an axially flexible connection to prevent the bottoming out of the liner element against the bottom wall of the cell.
Description
- 1. Field of the Invention
- This invention relates to protective headgear and other impact absorbing structures. It relates especially to an impact absorbing compression member for use therein.
- 2. Background Information
- Headgear such as a helmet is often worn by individuals during games and other physical activities to help protect the wearers from head injury. Head injury can result from impact forces due to contact with other people or objects. Currently marketed helmets generally fall into one of two categories, i.e. single impact helmets or multiple impact helmets. Single impact helmets undergo permanent deformation under impact, whereas multiple impact helmets are capable of withstanding multiple blows. The wearers of single impact helmets include, for example, bicyclists and motorcyclists. On the other hand, participants in sports such as hockey and football and construction workers generally wear multiple impact helmets. Both categories of helmets have similar constructions which include a semi-rigid outer shell which distributes the force of an impact over a wide area, a crushable layer inside the shell which reduces the force of the impact on the wearer's head, and usually also an inner liner that helps to shape the helmet to the wearer's head. Invariably, such helmets also include a chin strap for securing the helmet to the wearer's head.
- Recently, there has been developed a class of protective headgear incorporating a plurality of energy-absorbing layers. Such headgear is disclosed, for example, in publications WO2006/089234 and WO2006/089235 and US2007/0190292, published Aug. 16, 2007, the contents of all of which are hereby incorporated by reference herein. As seen there, such helmets include a semi-rigid outer layer or shell, an inner layer and a middle layer between the outer and inner layers. This middle layer is composed of a plurality of individual compressible cells disposed in a fluid-containing interstitial region formed by the inner and outer layers. At least one passageway is provided by which fluid can leave the middle layer as the outer layer deforms in response to an impact on the helmet. Such helmets may also contain a dynamic inner liner whose shape can change to conform to a wearer's head as each helmet is drawn down on the head by the associated chin strap; see WO2006/089098.
- As seen from the aforesaid publications, each impact absorbing cell of the middle layer of the helmet comprises at least one thin-walled enclosure having an uncompressed configuration which defines a hollow chamber, a volume of fluid at least partially filling that chamber, at least one orifice through the enclosure wall that resistably vents fluid from the chamber in response to an impact on the enclosure and an impact-absorbing mechanism associated with the enclosure that resists yielding in response to an initial phase of an impact on the enclosure, and that yields to the impact after the initial phase of the impact to allow the remainder of the impact to be managed by the fluid venting from the orifice. In a preferred protective helmet, the dynamic inner liner is composed of individual compressible elements positioned at the cell locations and whose shapes can change to conform to a wearer's head as the helmet is drawn down on the head by an associated chin strap assembly. Thus, each cell and the corresponding compressible element form a unitary compression member.
- While the aforesaid protective helmets and structures employing such impact-absorbing compression members perform their impact-absorbing function quite well, the total thickness of the helmet layers is larger than might be desired. Also, the compressible structures forming the dynamic inner liner of the helmet are usually simply foam pads or capsules adhered to the underside of the associated cell and are prone to bottoming out when the helmet is pressed against the wearer's head by high impact forces, thus causing discomfort to the wearer. Simply increasing the thickness of the pads in an attempt to overcome this problem results in an undesirable increase in helmet size.
- Accordingly, it is an object of the present invention to provide a compression member in the nature of a shock absorber for providing the middle layer and liner of a helmet or other protective structure.
- A further object of the invention is to provide such a compression member which has minimal overall thickness, yet whose components do not tend to bottom out under the compression forces encountered during normal use of the member.
- Another object of the invention is to provide a compression member of this type which is relatively easy to releasably attach to the inner layer of a helmet or other protective structure.
- Still another object of the invention is to provide such a compression member which when incorporated into a helmet along with a multiplicity of other similar members produces headgear which is comfortable to wear for a prolonged period even when the helmet is repeatedly impacted from without.
- A further object is to provide such a compressible member composed of a few molded plastic parts which are relatively easy to assemble.
- Other objects will, in part, be obvious and will, in part, appear hereinafter. The invention accordingly comprises the features of construction, combination of elements and arrangement of parts which will be exemplified in the following detailed description, and the scope of the invention will be indicated in the claims.
- In general, my protective helmet compression member includes a hollow, axially symmetric compression cell having an upper wall, a side wall and a flanged bottom wall. The compression member also includes a compressible liner element mounted to the flange. This element is composed of a hollow flexible envelope having a bottom wall and a side wall extending upwardly/inwardly from that bottom wall and connected to a radial flange that is secured flush to the cell flange. The envelope is substantially filled by one or more resilient pads.
- Preferably, the bottom wall of the cell inboard the cell flange is curved upwardly, giving the cell a dished or concave undersurface to provide additional clearance for the pad(s). This construction along with the pad(s) enables the compression member to withstand appreciable compression forces without the liner element bottoming out against the underside of the cell. Resultantly, when a multiplicity of the compression members are incorporated into a protective structure such as a football helmet, the structure is comfortable to wear for a prolonged period, despite repeated impacts thereto.
- For a further understanding of the nature and objects of the invention, reference should be made to the following detailed description taken in connection with the accompanying drawings, in which:
-
FIG. 1 is a side elevational view of a protective helmet incorporating compression members in accordance with this invention; -
FIG. 2 is a perspective view, on a larger scale, showing one of the compression members of theFIG. 1 helmet in greater detail; -
FIG. 3 is an exploded perspective view showing the components of theFIG. 2 compression member in greater detail, and -
FIG. 4 is a sectional view taken along line 3-3 ofFIG. 2 . - Referring to
FIG. 1 of the drawings, compression members incorporating the invention and indicated generally at 10 are shown incorporated into a protective structure, i.e., a football helmet H having an outer layer or shell shown in phantom at O and an inner layer I.Members 10 are releasably secured to layer I. As described in the above publications, shell O is of a relatively hard plastic material that deforms locally and radially in response to an impact, and the inner layer I may be of a softer, less rigid material. - Each
compression member 10 comprises a hollow, compressible,resilient cell 12 which extends between the inner and outer layers, and acompressible liner element 14 located directly oppositecell 12 and which projects from the interior surface of layer I.Cells 12 collectively form a helmet middle layer in an interstitial region between layers O and I andelements 14 collectively form a dynamic inner liner of the helmet. - As shown in
FIG. 4 , eachmember 10 is secured in a different opening P in inner layer I by capturing the edge of that opening P between theassociated cell 12 and itsliner element 14. The inner layer I is somewhat elastic so that themember 10 may be attached to layer I by forcing itscell 12 through opening P, whose edge then snaps into a peripheral recess around the cell as will be described in detail later. - Each
cell 12 comprises atop wall 22, abowed side wall 24 composed of a pair of back-to-back frustoconicallyshaped segments radial flange 26 extending out from the free lower edge of thesegment 24 b, leaving a large central opening within the flange. Avent hole 27 is provided intop wall 22. In one working example ofmember 10 suitable for a football or motorcycle helmet, thetop wall 22 has a diameter of 1.9 in., theside wall 24 has a diameter of 2.0 in. at the equator with an included angle θ of 155 to 162 degrees betweensegments flange 26 has an outer diameter of 2.3 in.Cell 12 is of a material, e.g. TPU, which is relatively stiff, yet allows the cell as a whole to flex to provide the impact absorbing characteristics described in the above publications. - A
plate 28 of the same material about 0.04 in. thick is positioned against the underside of the flange and the two are welded together at their edges to close and complete the bottom of the cell. Preferably acentral area 28 a of the plate is domed or upwardly curved (about 0.08 in. deflection) to conform to a typical head curvature for reasons to be described later. Also, a circular step orwall 28 b may be provided on the upper surface of the plate to center the cell on the plate. - As shown in
FIGS. 2 and 3 , theliner element 14 is coaxial tocell 12 and has more or less the same footprint as the cell. Instead of being a simple compressible bellows capsule or pad as described in the above publications, eachelement 14 is a composite structure which includes a cup-like hollow envelope ormembrane 32, a first, softresilient pad 34 and a second, smaller, denserresilient pad 36. -
Envelope 32 is of a flexible plastic material such as TPU. It has acircular bottom wall 38 with a gently roundededge margin 38 a which extends up to the radially outer edge of a relatively stiffannular shoulder 42. The inner edge ofshoulder 42 connects to a short, e.g. 0.06 in.,upstanding neck 44 whose upper end transitions to a radiallyouter flange 46. The outer diameter offlange 46 is substantially the same as that offlange 26 andplate 28 ofcell 12. - In accordance with the invention, the
bottom wall envelope 32, while strong, is also quite thin and flexible, whereas the envelope shoulder, neck and flange have thicker walls so that they are individually relatively stiff. In the above working example, thewall member 10, the overall height of the liner element is in the order of 0.33 inch. - As best seen in
FIGS. 3 and 4 , thepad 34 is die cut of a foam material, e.g. open cell polyurethane foam of density 18 to 15 lb./cu.ft. and its diameter, e.g. 2.05 in., and thickness, e.g. 0.28 in., are such that the pad can fit within the confines of envelopebottom wall - On the other hand, the
smaller pad 36 is die cut of a stiffer plastic foam material, e.g. vinyl nitrile 602 having a density 17 to 25 lb./cu.ft. and its diameter, e.g. 1.4 in., and thickness, e.g. 0.20 in., are such as to enable that pad to fit within theneck 44 ofenvelope 32 betweenpad 36 andplate 28. Thepads FIG. 3 , notFIG. 4 . They assume the shapes shown inFIG. 4 when the envelope ormembrane - To assemble the
liner element 14 tocell 12, thepad 34 is inserted intoenvelope 32 so that it is flush againstbottom wall 38. Then, pad 36 is positioned against the underside ofplate portion 28 a withinneck 44. To holdpad 36 in place during assembly, an adhesive or double sided tape (not shown) may be interposed betweenpad 36 and theplate portion 28 a. Finally, theflange 46 ofenvelope 32 and theflange 26 ofcell 12 are positioned together coaxially and welded or otherwise secured together as shown at 50 inFIG. 4 . This leaves theshoulder 42 andneck 44 free to flex in the axial direction. - Preferably, the thickness of
pad 36 is such that when the two flanges are secured together at 50, the twopads plate 28 andbottom wall liner element 14 constitutes a soft pillow that conforms to the shape of any surface contacting that wall. The fact that theliner element 14 is movable axially relative tocell 12 and the presence of the pads minimize the likelihood of theliner element 14 bottoming out should that element be subjected to high compression forces due to impacts to helmet H (FIG. 1 ) when the helmet is on a wearer's head. That thecentral portion 28 a ofplate 28, i.e. the area thereof within thecell 12, is upwardly curved or dished as described above also helps in this respect in that it provides additional clearance between the plate and a wearer's head without increasing the overall height of thecompression member 10. This height is typically in the order of 2.0 in. for acell 10 used in a helmet. That height may me as small as 1.0 in. when the cell is used in other applications, e.g. as a jaw shock absorber. - When a player dons the helmet H, the
composite liner element 14 of eachcompression member 10 conforms to the wearer's head resulting in a very comfortable fit of the helmet to the head. Yet, eachmember 10 still has a relatively low profile within helmet H so that the helmet is no larger than a conventional helmet that does not incorporate themembers 10. Finally, because of the aforesaid composite construction of theliner element 14, that element is not likely to bottom out during normal use of the helmet. - It will thus be seen that the objects set forth among those made apparent from the preceding description above are efficiently attained. Also, certain changes may be made in the construction described above without departing from the scope of the invention. For example, although the
cell 12 of thecompression member 10 specifically described has a circular cross section, other cell shapes are possible so long as the edges of the cell form a symmetrical shape that passes through a specific set of points arranged in a specific pattern as described in the above US2007/0190292 and theliner element 14 has more or less the same footprint as the cell flange. Also, instead of formingpads - It is also understood that the following claims are intended to cover all of the generic and specific features of the invention described herein.
Claims (9)
1. A compression member for a protective structure, said member comprising:
a hollow, axially symmetric compression cell having a top wall, a bowed side wall and a bottom flange extending laterally out from the side wall, and a plate that is coextensive with the flange position and against the underside of the flange, said flange and plate secured together at their peripheries;
a liner element secured coaxially to said cell, said liner element including an axially flexible envelope with a bottom wall extending up to an outer edge of an annular shoulder that has an inner edge connected to a laterally extending second flange that is coextensive with said plate, said second flange being positioned against the underside of the plate and the second flange and plate being secured together at their peripheries, and
a resilient material substantially filling said envelope.
2. The member defined in claim 1 wherein the resilient material is composed of at least two layers having different densities with the least dense layer being adjacent to said bottom wall.
3. The member defined in claim 2 wherein said layers are comprised of plastic foam.
4. The member defined in claim 3 wherein the layers are separate foam pads.
5. The member defined in claim 1 wherein the plate has an upwardly dished central area inboard said cell flange to provide additional clearance for the resilient material adjacent to the plate.
6. The member defined in claim 1 wherein the inner edge of the annular shoulder is connected to the second flange by way of a neck.
7. The member defined in claim 6 wherein said resilient material comprises a relatively soft first layer adjacent to and coextensive with the bottom wall and a second, smaller, denser layer within said neck between said first layer and said plate.
8. The member defined in claim 7 wherein said plate has an upwardly dished central area inboard the cell flange to provide additional clearance for said second layer.
9. The member defined in claim 1 wherein the cell and liner element each have a circular cross-section.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/360,864 US20100186150A1 (en) | 2009-01-28 | 2009-01-28 | Protective headgear compression member |
CA2750596A CA2750596C (en) | 2009-01-28 | 2010-01-27 | Protective headgear compression member |
EP10704026A EP2381808A1 (en) | 2009-01-28 | 2010-01-27 | Protective headgear compression member |
PCT/US2010/000211 WO2010087957A1 (en) | 2009-01-28 | 2010-01-27 | Protective headgear compression member |
TW099102402A TW201036564A (en) | 2009-01-28 | 2010-01-28 | Protective headgear compression member |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US12/360,864 US20100186150A1 (en) | 2009-01-28 | 2009-01-28 | Protective headgear compression member |
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US20100186150A1 true US20100186150A1 (en) | 2010-07-29 |
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ID=42115628
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/360,864 Abandoned US20100186150A1 (en) | 2009-01-28 | 2009-01-28 | Protective headgear compression member |
Country Status (5)
Country | Link |
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US (1) | US20100186150A1 (en) |
EP (1) | EP2381808A1 (en) |
CA (1) | CA2750596C (en) |
TW (1) | TW201036564A (en) |
WO (1) | WO2010087957A1 (en) |
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Also Published As
Publication number | Publication date |
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WO2010087957A1 (en) | 2010-08-05 |
CA2750596C (en) | 2017-12-12 |
EP2381808A1 (en) | 2011-11-02 |
CA2750596A1 (en) | 2010-08-05 |
TW201036564A (en) | 2010-10-16 |
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